A field survey of dioecious plants in Israel: sex ratio in seven rare species

Sex ratio was tested in seven rare dioecious species in Israel. This was in order to complete a previously published sex ratio survey of the other 41 dioecious species in Israel, and to examine further the hypothesis that sex ratio in natural populations is usually 1:1. One population was tested in each of five rare wild species. In addition, one rare feral population was tested in each of two non-native, naturalized tree species. Sex ratio in all seven species tested was not different from the expected 1:1. These results strengthen the suggestion that in natural populations of dioecious plants sex ratio is usually 1:1.